850D (T8I) OR M50 Mark ii

I bought two Canon M50 MKII cameras, each with their own EF-M lens.  I also have three Canon T7i (800D) cameras which are very similar to the Canon T8i (850D) camera.  If I had to choose between the two with what I know now I would pick the Canon T8i (850D) camera.

The reasons for the T8i (850D):

1) The OVF is easier to see through than the EVF.

2) There's a wider range of lenses available that do not need an adapter.  It would work well with something like a Canon 100-400mm lens or Sigma/Tamron 150-600mm lens.

What I don't like about the Canon M50 MKII:

1) I do not like the sensor that automatically shuts off the LCD screen if a person gets too close to it.  I like to use the LCD screen and viewfinder, both at the same time.

2) I like the smaller size of the Canon M50 MKII, but in some ways it is too small.

In general:

From my perspective, there are still too many growing pains with the Canon mirrorless cameras.  We don't know for sure, but in the future Canon may only have a RF mount, for both full frame and crop mirrorless cameras.  The may abandon the EF-M mount for lenses.  Again...but we don't know for sure.

I still like all of them, including the Canon M50 MKII.  I'm just giving you a brief answer of what I would pick, if I had to choose between the two of them.  There's probably more reasons, but those are the ones I can think of that come to the top of my head.  Definitely I would choose the Canon T8i (850D) camera.